Commit 4666669f authored Aug 16, 2013 by Alexander Aring Committed by David S. Miller Aug 20, 2013

6lowpan: introduce lowpan_fetch_skb function



This patch adds a helper function to parse the ipv6 header to a
6lowpan header in stream.

This function checks first if we can pull data with a specific
length from a skb. If this seems to be okay, we copy skb data to
a destination pointer and run skb_pull.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Werner Almesberger <werner@almesberger.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 31afe1f7

net/ieee802154/6lowpan.h

+12 −0

Original line number	Diff line number	Diff line
		@@ -230,4 +230,16 @@
		dest = 16 bit inline */
		#define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */

		static inline bool lowpan_fetch_skb(struct sk_buff *skb,
		void *data, const unsigned int len)
		{
		if (unlikely(!pskb_may_pull(skb, len)))
		return true;

		skb_copy_from_linear_data(skb, data, len);
		skb_pull(skb, len);

		return false;
		}

		#endif /* __6LOWPAN_H__ */